Abstract

A model of experimental autoimmune myocarditis (EAM), induced with cardiomyosin peptide specific T lymphocytes in female Lewis rats, was used to study acute hemodynamic and coronary vasculature changes. After injection of T cells 15 experimental animals (5 each at 1, 2 and 3 weeks) and 8 controls were studied using the isolated heart. The pO2 was measured using EPR oximetry. Effluent oxygen and coronary flow increased while coronary resistance decreased (p<.05) with EAM (1, 2 and 3 weeks). Heart/body weight increased while rate-pressure product, +dP/dt and -dP/dt decreased (p<.05) compared to controls at 1 week but not at 2 or 3 weeks. Myocardial oxygen consumption and mean pO2 were not different for EAM versus control. However, compared to controls EAM myocardial pO2 varied more widely and was often beyond the usual range, suggesting occurrence of localized hypoxic and hyperoxic areas. Decreased coronary resistance, increased coronary flow and pO2 heterogeneity are consistent with development of low resistance, high flow hyperoxic areas which steal flow causing hypoxia in other areas.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR011602-03
Application #
6123372
Study Section
Project Start
1998-09-15
Project End
1999-08-31
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
3
Fiscal Year
1998
Total Cost
Indirect Cost

  Institution

Name
Dartmouth College
Department
Type
DUNS #
041027822
City
Hanover
State
NH
Country
United States
Zip Code
03755

  Publications

Sinha, Birandra K; Leinisch, Fabian; Bhattacharjee, Suchandra et al. (2014) DNA cleavage and detection of DNA radicals formed from hydralazine and copper (II) by ESR and immuno-spin trapping. Chem Res Toxicol 27:674-82
Dunn, Jeff F; Khan, Mohammad N; Hou, Huagang G et al. (2011) Cerebral oxygenation in awake rats during acclimation and deacclimation to hypoxia: an in vivo electron paramagnetic resonance study. High Alt Med Biol 12:71-7
Shen, Jiangang; Khan, Nadeem; Lewis, Lionel D et al. (2003) Oxygen consumption rates and oxygen concentration in molt-4 cells and their mtDNA depleted (rho0) mutants. Biophys J 84:1291-8
Khan, Nadeem; Wilmot, Carmen M; Rosen, Gerald M et al. (2003) Spin traps: in vitro toxicity and stability of radical adducts. Free Radic Biol Med 34:1473-81
Pogue, Brian W; O'Hara, Julia A; Demidenko, Eugene et al. (2003) Photodynamic therapy with verteporfin in the radiation-induced fibrosarcoma-1 tumor causes enhanced radiation sensitivity. Cancer Res 63:1025-33
Hou, Huagang; Grinberg, Oleg Y; Taie, Satoshi et al. (2003) Electron paramagnetic resonance assessment of brain tissue oxygen tension in anesthetized rats. Anesth Analg 96:1467-72, table of contents
Chen, Bin; Pogue, Brian W; Goodwin, Isak A et al. (2003) Blood flow dynamics after photodynamic therapy with verteporfin in the RIF-1 tumor. Radiat Res 160:452-9
Dunn, Jeff F; Swartz, Harold M (2003) In vivo electron paramagnetic resonance oximetry with particulate materials. Methods 30:159-66
Khan, Nadeem; Shen, Jiangang; Chang, Ta Yuan et al. (2003) Plasma membrane cholesterol: a possible barrier to intracellular oxygen in normal and mutant CHO cells defective in cholesterol metabolism. Biochemistry 42:23-9
James, Philip E; Madhani, Melanie; Roebuck, William et al. (2002) Endotoxin-induced liver hypoxia: defective oxygen delivery versus oxygen consumption. Nitric Oxide 6:18-28

Showing the most recent 10 out of 44 publications